On my openSUSE Tumbleweed (KDE/Plasma 5.27.4) I have to Monitors.
Main Monitor is an 32" UHD Monitor.
2nd Monitor is a 16" FullHD Minitor.
Use both as extended monitor setup (Ground Line adjusted) with X11 window manager.
If I shift a window to the 2nd Monitor and start to rescale them with the mouse on the button frame, it stops somewhere 1/5 above the ground line. It is not possible to extend the screen, only with the maximize button on the window (or with the middle mouse key to scale it top/button only).
Any idea about the root cause?
Should I create a bug report and if yes to kwin, X11 or …?